EP 0498876 B1 19941214 - METHOD FOR DETERMINING THE ROTATIONAL SPEED OF A DRILL BIT.
Title (en)
METHOD FOR DETERMINING THE ROTATIONAL SPEED OF A DRILL BIT.
Title (de)
VERFAHREN ZUR BESTIMMUNG DER DREHGESCHWINDIGKEIT EINES BOHRMEISSELS.
Title (fr)
PROCEDE DE DETERMINATION DE LA VITESSE DE ROTATION D'UN OUTIL DE FORAGE.
Publication
Application
Priority
- FR 9010971 A 19900904
- FR 9100699 W 19910830
Abstract (en)
[origin: WO9204527A1] A method for determining the rotational speed of a drill bit (16) arranged at one end of a rotating drill string (20). According to the method, the axial acceleration at one point on the drill string is measured, this measurement is processed to determine the acceleration's energy content, and a correction is applied to this energy value in order to determine the rotational speed.
IPC 1-7
IPC 8 full level
E21B 47/00 (2006.01); G01P 3/44 (2006.01); G01P 7/00 (2006.01)
CPC (source: EP US)
E21B 44/00 (2013.01 - EP US); G01P 3/44 (2013.01 - EP US); G01P 7/00 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
WO 9204527 A1 19920319; AT E115680 T1 19941215; CA 2072139 A1 19920305; CA 2072139 C 19970826; DE 69105943 D1 19950126; DE 69105943 T2 19950713; DK 0498876 T3 19950522; EP 0498876 A1 19920819; EP 0498876 B1 19941214; ES 2068605 T3 19950416; FR 2666374 A1 19920306; FR 2666374 B1 19960126; JP 3195600 B2 20010806; JP H05502489 A 19930428; NO 303915 B1 19980921; NO 921750 D0 19920504; NO 921750 L 19920525; OA 09591 A 19930430; US 5277061 A 19940111
DOCDB simple family (application)
FR 9100699 W 19910830; AT 91916343 T 19910830; CA 2072139 A 19910830; DE 69105943 T 19910830; DK 91916343 T 19910830; EP 91916343 A 19910830; ES 91916343 T 19910830; FR 9010971 A 19900904; JP 51548891 A 19910830; NO 921750 A 19920504; OA 60221 A 19920527; US 84936192 A 19920429